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Table 2 Correlation coefficients for low and high volumes of expired air and the three ultrasound methods to measure diaphragm movement

From: The Area method: a new method for ultrasound assessment of diaphragmatic movement

 

Mean

Low volume

High volume

Correlation coefficient

95% CI

p value

Correlation coefficient

95% CI

p value

M-mode

4.49

0.85

(0.74–0.96)

< 0.01

0.43

(0.17–0.68)

< 0.01

Area method

3.78

0.84

(0.71–0.96)

< 0.01

0.29

(0.07–0.64)

0.11

B-mode

3.82

0.61

(0.35–0.86)

< 0.01

0.14

(− 0.19–0.48)

0.4